<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Amf
 * @subpackage Response
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Http.php 24482 2011-09-29 14:19:21Z matthew $
 */

/** Zend_Amf_Response */
require_once 'Zend/Amf/Response.php';

/**
 * Creates the proper http headers and send the serialized AMF stream to standard out.
 *
 * @package    Zend_Amf
 * @subpackage Response
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Amf_Response_Http extends Zend_Amf_Response {
	/**
	 * Create the application response header for AMF and sends the serialized AMF string
	 *
	 * @return string
	 */
	public function getResponse() {
		if (! headers_sent ()) {
			if ($this->isIeOverSsl ()) {
				header ( 'Cache-Control: cache, must-revalidate' );
				header ( 'Pragma: public' );
			} else {
				header ( 'Cache-Control: no-cache, must-revalidate' );
				header ( 'Pragma: no-cache' );
			}
			header ( 'Expires: Thu, 19 Nov 1981 08:52:00 GMT' );
			header ( 'Content-Type: application/x-amf' );
		}
		return parent::getResponse ();
	}
	
	protected function isIeOverSsl() {
		$ssl = $_SERVER ['HTTPS'];
		if (! $ssl || ($ssl == 'off')) {
			// IIS reports "off", whereas other browsers simply don't populate
			return false;
		}
		
		$ua = $_SERVER ['HTTP_USER_AGENT'];
		if (! preg_match ( '/; MSIE \d+\.\d+;/', $ua )) {
			// Not MicroSoft Internet Explorer
			return false;
		}
		
		return true;
	}
}
